Beyem Neocal Muro Nature

Lightweight, hydraulic lime mortar with natural cork for rendering.

BEYEM NEOCAL MURO NATURE is a lightweight, breathable, rainwater-proof, natural hydraulic lime (NHL) rendering mortar, suitable for both building rehabilitation and new construction. Formulated with natural hydraulic lime (NHL), pozzolan, selected aggregates, natual cork granules and organic additives. Especially suitable for rehabilitation of historic and/or protected buildings (old masonry walls). Natural composition. Free of Portland cement. Indoor environment quality. Classifed as A+ class according to Décret nº. 2011-321 (France). Free of radionuclides.

  • Suitable for spray render and pump machines or manual applications.
  • Improves thermal and acoustic performance.
  • Lightweight. Great coverage.
  • Mechanical strengths corresponding to lime mortars.
  • High water vapour permeability. Allows the wall to breathe.
  • Great plasticity. Excellent adhesion
  • Compatible with old masonry brickworks/walls.
  • Applicable  directly to the building enclosure.
  • Rainwater- proof. Weather resistant.
  • Free of chlorides.
  • Suitable for internal or external walls.
  • New construction and building rehabilitation.
  • Natural bacteriostatic and natural fungistatic.
  • Very low VOCs  emissions.
  • Radiation-free certificate.
  • Mineral product.

Natural hydraulic lime, lightwight rendering mortar for both building rehabilitation and new construction. Suitable to compensate uneven surfaces and flatness of the support. Suitable for walls and ceilings both in interior and exterior situations, manually or mechanically. Specially designed for restoration and protection of walls and walls of old masonry, due to its natural composition and high breathability.

BEYEM NEOCAL MURO NATURE  is  suitable for:

  • New construction and rehabilitation brickwork. Ceramic bricks.
  • Traditional plastering /rendering mortars.
  • Stonework.

Substrates must be clean, compact and free of substances that reduce adhesion such as dust, oil, grease and with no loose material. Substrates must submit an adequate porosity and surface roughness. Uneven areas must be corrected. Dampen substrates with water to cool down and wait until the thin layer of water disappears. It is a good practice curing with a fine spray of clean water 24 h after application. Curing operation is essential to avoid  rapid drying and depends on the degree of porosity and surface absorption. If necessary, fill in the gaps of the substrate with BEYEM NEOCAL MUR and let harden.

Do not apply on gypsum-based plasters, paint, metal surfaces, plastic, surface waterproofing products  or materials with low mechanical properties. Consult our technical department to apply on cellular concrete.

Mix manually or mechanically BEYEM NEOCAL MURO NATURE with 5,5-6,0 l per bag of clean water until a homogeneous, creamy and lump-free paste is obtained. Let the mix stand for 5 minutes before application. To apply with render  spray machine, it´s necessary to set the relation water/mortar  and pump pressure depending on section and length of hose  and climatology conditions. It´s important to maintain the  variables affecting the properties of the applied mortar (distance to the wall, angle of application and water proportion).

Substrates should be previously wetted until they are saturated, preventing waterlogging, and applying the mortar  once the surface has a matt appearance.

Spread the mixed product with a trowel (in case of manually or mechanically application) leaving  10-15 mm of average  thickness depending on the desired finish. Ticknesses up to 30 mm can be applied in layers of 15 mm thick per every 48 h. Mark the pieces using PVC splines. Press to ensure adhesion and expel the air contained in the pores. Smooth with a ruler the applied material to regulate thickness. When BEYEM NEOCAL BASE is green (set but not fully hardened) it should be finished using the appropriate tool  depending on the desired texture (trowelled, scraping…). Time until finishing depends of substrate, temperature and humidity.

  • Always mix with the specified amount of water.
  • Do not apply below 5ºC or above 30ºC.
  • Do not apply when there is risk of frost, rain, strong wind or direct sunlight.
  • It is not advisable to apply on horizontal or sloped surfaces in exterior situations.
  • Protect top edges of facade from rainwater penetration.
  • Above 15 mm of thickness, apply the product in two layers, leaving a roughness surface in the first to improve the adhesion of the second layer.
  • In any case, for an optimal finish, it is recommended to apply an uniform layer of  0.5 cm thickness approx. to avoid the appearance of  cracks in subsequent layers.
  • The minimum finishing thickness of render must be 10 mm, to contribute actively to the  waterproofing.
  • Lime mortars have a slower setting, so the hardening time increases.
  • Expansion joints should be included as required by the substrate and respected by all applied materials.
  • Reinforcement with alkali resistant fiberglass mesh  may also be required, dependent upon substrate condition ( junctions of different surfaces, corners of voids…),  project specification or applied thickness greater than recommended.
  • As a basecoat mortar, is recommended to leave a rough finish.

Product identity. Properties of mixture and application data





Bulk density

≈ 1150 Kg/m3

Density of the mix

≈ 1700 Kg/m3


0-2 mm

Mixing water,% 

± 23 %

   Minimum finishing thickness

10 mm

   Maximum thickness  per layer

15 mm

   Maximum thickness application

30 mm (two layers)


12 Kg/m2  per cm of thickness

Tariff code


Final performances





≥ 0,20 MPa

Compressive  strength

≥ 1,5 MPa 

Water absorption

≤ 0,4 Kg/m2 min1/2

Water vapor permeability

µ ≤ 15

Thermal conductivity

0,51 W/m·k

Reaction to fire

Euroclass A1

Total VOCs (28 days)

< 500 µg/m3

Radioactivity index (U, Ra, Pb, Th, others)

I = 0,107

BEYEM NEOCAL  MURO NATURE is packed 25 kg plastic lined paper bags.

Storage: when stored unopened in a cool dry place, shelf life is 12 months from date of manufacture.

Tools can be cleaned easily with water before the product hardens. Hardened product can be removed only mechanically.

Facade rehabilitation of historic and/or protected buildings, must be carried out with highly breathable, natural hydraulic lime, Portland cement free, lightweight rendering mortar with cork granules (free of COVs and radiation) compliant with EN 998-1- Class OC CSII Wc 1, such as BEYEM NEOCAL MURO NATURE manufactured by Rodacal Beyem Company. Coverage will be ≈ 1,2 kg/m2 per mm of thickness. The substrate must be clean, sound, compact and dimensionally stable. Expansion joints must be respected.

For further and complete information about the safe use of our product please refer to our latest version of the Safety Data Sheet, which is available upon request.

Disposal of the product and packaging must be in accordance with current legislation. This is responsibility of the final product user.


Technical sheet

Component Safety Data Sheet

Declaration of benefits

Factory Production Control Certificate

Certificado Sistema Gestión de Calidad ISO 9001

Certificado Sistema Gestión de la I+D+i UNE 166002

Declaración Compuestos Orgánicos Volátiles

Certificado Libre de Radiación


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